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      03-05-2013, 12:43 PM   #35
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Drives: BMW F10 - Matte Blue
Join Date: Mar 2012
Location: Norway, Scandinavia

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Originally Posted by ColdList View Post
Agreed. That would be very odd. This is interesting for sure. I had "HEARD" (disclaimer here: I do not know this as FACT and you should do your own investigating and form your own opinion on anything I write and not ever take my word for anything :-) that Hartge used a piggyback and it did have this increase in power and that one subsequent runs it lost power and gradually shut the car down after 10 hours. The DME shut it down. Now agian, this is what I HEARD and I have no idea if it has any truth behind it. I wold be very interested to see a Hartge piggyback on a car over her ein the US and have feedback form the owner.

As far as the Dyno on the F10. The freaking manual is literally 2 pages. :-) I am no engineer so I cannot speak to why you have to do things like have the hood closed but I know the car has very specific parameters that must be followed and precise logging that needs to be done and compared to certain tables. For one thing if the wheels are moving fast enough to represent 150 mph then the wind has to be detected as flowing at 150 mph into the intakes (true 1:1) or the DME plays tricks. Also the gear must be true 1:1 (which means 5th gear and the US cars cannot actually do that due to the limiter.) Again, I am no expert. I don't know how the car works beyond a lot of discussions with people who do know when I was doing the research for my own knowledge after seeing my DME doing strange things during some actual logging. It all seemed to line right up with what I was hearing.
Would be very cool to get some real world feedback on the Hartge form an end user. btw..I think they were reporting 4.2 second 0-62. Not entirely faster than stock no? I thought that was weird.
I agree that a real world customer experience should be interesting to hear about all of the different tuner claims.

The 0-62 is very difficult to better signifiantly without increasing grip as well. The stock M5 is struggling for grip and could do a lot quicker on slicks/semi slicks. The increased power is better indicated in the 80-200km/h runs or in the trap speed on a quarter mile run. Like the quarter mile run that was reported for one tuned car here that did not have a higher trap speed than a std M5... You can get a better launch and hence a better ET with better tires, but the trap speed indicates if you got more hp.

I guess Gustav of M5Board/GTBoard might know more about the Hartge tune and any issues with it.